Compounds of the formula ##STR1## where W is ##STR2## n is 0, 1, or 2; m is 0, 1, 2, or 3; Y and G are each independently oxygen or sulfur; Z is --O--, --S--, --NH, or --CH.sub.2 ; R.sub.1 is hydrogen, C.sub.1 to C.sub.8 alkyl, substituted C.sub.1 to C.sub.8 alkyl substituted with one hydroxy, C.sub.3 to C.sub.8 alkenyl, C.sub.3 to C.sub.8 alkynyl, aryl, C.sub.1 to C.sub.3 alkylaryl, C.sub.1 to C.sub.3 alkylheteroaryl, or --Q--R.sub.4 ; R.sub.2 and R.sub.3 are each independently hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, C.sub.1 to C.sub.3 alkylaryl, or C.sub.1 to C.sub.3 alkylheteroaryl; R.sub.4 is cyano, trifluoromethyl, --COR.sub.9, --CO.sub.2 R.sub.9, --CONR.sub.9 R.sub.10, --OR.sub.9, --SO.sub.2 NR.sub.9 R.sub.10, or --S(O).sub.q R.sub.9 ; R.sub.9 and R.sub.10 are each independently hydrogen, C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.3 alkylaryl, aryl, or R.sub.9 and R.sub.10 may together be taken to form a three- to seven-membered alkyl ring or a three- to seven-membered heteroalkyl ring having 1 heteroatom of O; Q is C.sub.1 to C.sub.3 alkyl; R.sub.11 is hydrogen, --OR.sub.12, or --NHCOR.sub.12 ; R.sub.12 is hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkyl-aryl; q is 0, 1, or 2; a first chiral carbon is designated by an asterisk; a second chiral carbon is designated by #; and the above aryl groups and the aryl moieties of the above alkyl-aryl groups are independently selected from phenyl and substituted phenyl, wherein said substituted phenyl may be substituted with one to three groups selected from C.sub.1 to C.sub.4 alkyl, halogen, hydroxy, cyano, carboxamido, nitro, and C.sub.1 to C.sub.4 alkoxy, and the pharmaceutically acceptable salts thereof.These compounds are useful in treating migraine and other disorders are new. These compounds are useful psychotherapeutics and are potent serotonin (5-HT.sub.1) agonists and may be used in the treatment of depression, anxiety, eating disorders, obesity, drug abuse, cluster headache, migraine, pain, and chronic paroxysmal hemicrania and headache associated with vascular disorders, and other disorders arising from deficient serotonergic neurotransmission. The compounds can also be used as centrally acting antihypertensives and vasodilators.

Claim:

What is claimed is:

1. A compound of the formula ##STR15## where W is ##STR16## n is 0, 1, or 2; m is 0, 1, 2, or 3: Y and G are each independently oxygen or sulfur; Z is --O--; R.sub.1 ishydrogen, C.sub.1 to C.sub.8 alkyl, substituted C.sub.1 to C.sub.8 alkyl substituted with one hydroxy, C.sub.3 to C.sub.8 alkenyl, C.sub.3 to C.sub.8 alkynyl, aryl, C.sub.1 to C.sub.3 alkylaryl, or --Q--R.sub.4 ; R.sub.2 and R.sub.3 are eachindependently hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkylaryl; R.sub.4 is cyano, trifluoromethyl, --COR.sub.9, --CO.sub.2 R.sub.9, --CONR.sub.9 R.sub.10, --OR.sub.9, --SO.sub.2 NR.sub.9 R.sub.10, or --S(O).sub.q R.sub.9 ; R.sub.9 and R.sub.10 are each independently hydrogen, C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.3 alkylaryl, aryl, or R.sub.9 and R.sub.10 may together be taken to form a three- to seven-membered alkyl ring or a three- to seven-membered heteroalkyl ringhaving 1 heteroatom of O; Q is C.sub.1 to C.sub.3 alkyl; R.sub.11 is hydrogen, --OR.sub.12, or --NHCOR.sub.12 ; R.sub.12 is hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkyl-aryl; q is 0, 1, or 2; a first chiral carbon isdesignated by an asterisk; a second chiral carbon is designated by #; the above alkyl, alkenyl, alkynyl, and alkylene moieties of other groups are linear, branched, cyclic, or be linear or branched and containing cyclic moieties; and the above arylgroups and the aryl moieties of the above alkyl-aryl groups are independently selected from phenyl and substituted phenyl, wherein said substituted phenyl may be substituted with one nitro or one to three groups selected from C.sub.1 to C.sub.4 alkyl,halogen, hydroxy, cyano, carboxamido, and C.sub.1 to C.sub.4 alkoxy, with the proviso that when n is 0 or 1 then w is formula iii, iv, or v, and the pharmaceutically acceptable salts thereof.

2. The compound of claim 1, wherein the compound of formula I is ##STR17##

3. The compound of claim 2, wherein the compound is the cis epimer.

4. The compound of claim 1, wherein the compound of formula I is the S epimer having the chiral carbon designated by #.

16. A pharmaceutical composition for treating disorders arising from deficient serotonergic neurotransmission comprising an amount of a compound according to claim 1 effective in treating such a disorder and a pharmaceutically acceptablecarrier.

17. A method for treating a condition selected from hypertension, depression, anxiety, eating disorders, obesity, drug abuse, cluster headache, migraine, pain, and chronic paroxysmal hemicrania and headache associated with vascular disorderscomprising administering to a mammal requiring such treatment an amount of a compound according to claim 1 effective in treating such condition.

18. A compound of the formula ##STR18## n is 0, 1, or 2; m is 0, 1, 2, or 3: Y and G are each independently oxygen or sulfur; Z is --O--; --S--, --NH, or --CH.sub.2 ; R.sub.2 and R.sub.3 are each independently hydrogen, C.sub.1 to C.sub.6alkyl, aryl, or C.sub.1 to C.sub.3 alkylaryl; R.sub.5 is C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkylaryl; R.sub.11 is hydrogen, --OR.sub.12, or --NHCOR.sub.12 ; R.sub.12 is hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 toC.sub.3 alkyl-aryl; a first chiral carbon is designated by an asterisk; a second chiral carbon is designated by #; the above alkyl and alkylene moieties of other groups are linear, branched, cyclic, or be linear or branched and containing cyclicmoieties; and the above aryl groups and the aryl moieties of the above alkyl-aryl groups are independently selected from phenyl and substituted phenyl, wherein said substituted phenyl may be substituted with one nitro or one to three groups selectedfrom C.sub.1 to C.sub.4 alkyl, halogen, hydroxy, cyano, carboxamido, and C.sub.1 to C.sub.4 alkoxy, with the proviso that when n is 0 or 1 and Z is --O--then w is iii, iv, or v.

19. The compound of claim 18, wherein the compound of formula II is ##STR19## 20.

20. The compound of claim 19, wherein the compound is the cis epimer.

21. The compound of claim 18, wherein the compound of formula II is the S epimer having the chiral carbon designated by #.

22. The compound of claim 18, wherein G is oxygen.

Description:

BACKGROUND OF THE INVENTION

The present invention relates to indole derivatives, to processes and intermediates for their preparation, to pharmaceutical compositions containing them and to their medicinal use. The active compounds of the present invention are useful intreating migraine and other disorders.

U.S. Pat. Nos. 4,839,377 and 4,855,314 and European Patent Application Publication Number 313397 refer to 5-substituted 3-aminoalkyl indoles. The compounds are said to be useful for the treatment of migraine.

British Patent Application 040279 refers to 3-aminoalkyl-1H-indole-5-thioamides and carboxamides. The compounds are said to be useful in treating hypertension, Raymond's disease and migraine.

European Patent Application Publication Number 303506 refers to 3-poly:hydropyridyl-5-substituted-1H-indoles. The compounds are said to have 5-HT.sub.1 receptor agonist and vasoconstrictor activity and to be useful in treating migraine.

European Patent Application Publication Number 354777 refers to N-piperidinyl:indolyl:ethyl-alkane sulfonamide derivatives. The compounds are said to have 5-HT.sub.1 receptor agonist and vasconstrictor activity and to be useful in treatingcephalic pain.

European Patent Application Publication Numbers 438230, 494774, and 497512 refers to indole-substituted five-membered heteroaromatic compounds. The compounds are said to have 5-HT.sub.1 -like receptor agonist activity and to be useful in thetreatment of migraine and other disorders for which a selective agonist of these receptors is indicated.

International Patent Application PCT/GB91/00908 and European Patent Application No. 313397A refers to 5-heterocyclic indole derivatives. The compounds are said to exhibit properties useful in the treatment and prophylaxis of migraine, clusterheadache, and headache associated with vascular disorders. These compounds are also said to have "5-HT.sub.1 -like" receptor agonism.

SUMMARY OF THE INVENTION

The present invention relates to compounds of the formula ##STR3## where W is ##STR4## n is 0, 1, or 2; m is 0, 1, 2, or 3; Y and G are each independently oxygen or sulfur; Z is --O--, --S--, --NH, or --CH.sub.2 ; R.sub.1 is hydrogen, C.sub.1 toC.sub.8 alkyl, substituted C.sub.1 to C.sub.8 alkyl substituted with one hydroxy, C.sub.3 to C.sub.8 alkenyl, C.sub.3 to C.sub.8 alkynyl, aryl, C.sub.1 to C.sub.3 alkylaryl, C.sub.1 to C.sub.3 alkylheteroaryl, or --Q--R.sub.4 ; R.sub.2 and R.sub.3 areeach independently hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, C.sub.1 to C.sub.3 alkylaryl, or C.sub.1 to C.sub.3 alkylheteroaryl; R.sub.4 is cyano, trifluoromethyl, --COR.sub.9, --CO.sub.2 R.sub.9, --CONR.sub.9 R.sub.10, --OR.sub.9, --SO.sub.2 NR.sub.9R.sub.10, or --S(O).sub.q R.sub.9 ; R.sub.9 and R.sub.10 are each independently hydrogen, C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.3 alkylaryl, aryl, or R.sub.9 and R.sub.10 may together be taken to form three-to seven-membered alkyl ring or a three-to seven-membered heteroalkyl ring having 1 heteroatom of O; R.sub.11 is hydrogen, --OR.sub.12, or --NHCOR.sub.12 ; R.sub.12 is hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkyl-aryl; q is 0, 1, or 2; Q is C.sub.1 to C.sub.3 alkyl; afirst chiral carbon is designated by an asterisk; a second chiral carbon is designated by #; and the above aryl groups and the aryl moieties of the above alkyl-aryl groups are independently selected from phenyl and substituted phenyl, wherein saidsubstituted phenyl may be substituted with one to three groups selected from C.sub.1 to C.sub.4 alkyl, halogen (e.g., fluorine, chlorine bromine or iodine), hydroxy, cyano, carboxamido, nitro, and C.sub.1 to C.sub.4 alkoxy, and the pharmaceuticallyacceptable salts thereof. These compounds are useful in treating migraine and other disorders.

The compounds of the invention include all optical isomers of formula I (e.g., R and S stereogenicity at any chiral site) and their racemic, diasteromeric, or epimeric mixtures. The epimers with the S absolute configuration at the chiral carbonsite designated by # in formula I are preferred. When R.sub.11 is hydrogen, the epimers with the R absolute configuration at the chiral carbon site designated by an asterisk in formula I are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 andn is O or 1, the epimers with the S absolute configuration at the chiral carbon site designated by an asterisk in formula I are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is 2, the epimers with the R absolute configuration at thechiral carbon site designated by an asterisk in formula I are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is O, the cis epimers [(2S, 3S) absolute configuration in the azetidine ring] are particularly preferred. When R.sub.11 is--OR.sub.12 or --NHCOR.sub.12 and n is 1, the cis epimers [(2S, 4R) absolute configuration in the pyrrolidine ring] are particularly preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is 2, the cis epimers [(2R, 5R) absolute configurationin the piperidine ring] are particularly preferred.

Unless otherwise indicated, the alkyl, alkenyl, and alkynyl groups referred to herein, as well as the alkyl and alkylene moieties of other groups referred to herein (e.g. alkoxy), may be linear or branched, and they may also be cyclic (e.g.cyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl) or be linear or branched and contain cyclic moieties.

Preferred compounds of the invention are compounds of the formula I wherein W is (i), (ii), or (iii); n is 1; m is 1; R.sub.1 is hydrogen, C.sub.1 to C.sub.3 alkyl, or --CH.sub.2 CH.sub.2 OCH.sub.3 ; R.sub.2 is hydrogen; and R.sub.3 is hydrogenor --CH.sub.2 Ph (Ph=phenyl). Of the foregoing preferred compounds, the epimers with the S optical configuration at the chiral carbon designated by # in formula I are more preferred. Of the foregoing preferred compounds, when R.sub.11 is hydrogen, theepimers with the R absolute configuration at the chiral carbon site designated by an asterisk in formula I are more preferred. Of the foregoing preferred compounds, when R.sub.11 is --OR.sub.12 or --NHCOR.sub.12, the epimers with the S absoluteconfiguration at the chiral carbon site designated by an asterisk in formula I are more preferred. Of the foregoing compounds, when R.sub.11 is --OR.sub.12 or --NHCOR.sub.12, the cis epimers [(2S, 4R) absolute configuration in the pyrrolidine ring] areparticularly preferred.

The present invention also relates to a pharmaceutical composition for treating a condition selected from hypertension, depression, anxiety, eating disorders, obesity, drug abuse, cluster headache, migraine, pain, and chronic paroxysmalhemicrania and headache associated with vascular disorders comprising an amount of a compound of the formula I or a pharmaceutically acceptable salt thereof effective in treating such condition and a pharmaceutically acceptable carrier.

The present invention also relates to a method for treating a condition selection from hypertension, depression, anxiety, eating disorders, obesity, drug abuse, cluster headache, migraine, pain and chronic paroxysmal hemicrania and headacheassociated with vascular disorders comprising administering to a mammal (e.g., a human) requiring such treatment an amount of a compound of the formula I or a pharmaceutically acceptable salt thereof effective in treating such condition.

The present invention also relates to a pharmaceutical composition for treating disorders arising from deficient serotonergic neurotransmission (e.g., depression, anxiety, eating disorders, obesity, drug abuse, cluster headache, migraine, painand chronic paroxysmal hemicrania and headache associated with vascular disorders) comprising administering to a mammal (e.g., a human) requiring such treatment an amount of a compound of the formula I or a pharmaceutically acceptable salt thereofeffective in treating such condition.

The present invention also relates to a method for treating disorders arising from deficient serotonergic neurotransmission (e.g., depression, anxiety, eating disorders, obesity, drug abuse, cluster headache, migraine, pain and chronic paroxysmalhemicrania and headache associated with vascular disorders) comprising administering to a mammal (e.g., a human) requiring such treatment an amount of a compound of the formula I or a pharmaceutically acceptable salt thereof effective in treating suchcondition.

The present invention also relates to a compound of the formula ##STR5## where W is ##STR6## n is 0, 1, or 2; m is 0, 1, 2, or 3; Y and G are each independently oxygen or sulfur; Z is --O--, --S--, --NH, or --CH.sub.2 ; R.sub.2 and R.sub.3 areeach independently hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, C.sub.1 to C.sub.3 alkylaryl, and C.sub.1 to C.sub.3 alkylheteroaryl; R.sub.5 is C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkylaryl (preferably benzyl); R.sub.11 is hydrogen,--OR.sub.12, or --NHCOR.sub.12 ; R.sub.12 is hydrogen, C.sub.1 to C.sub.8 alkyl, aryl, or C.sub.1 to C.sub.3 alkyl-aryl; a first chiral carbon is designated by an asterisk; a second chiral carbon is designated by #; and the above aryl groups and the arylmoieties of the above alkyl-aryl groups are independently selected from phenyl and substituted phenyl, wherein said substituted phenyl may be substituted with one to three groups selected from C.sub.1 to C.sub.4 alkyl, halogen (e.g. fluorine, chlorinebromine or iodine), hydroxy, cyano, carboxamido, nitro, and C.sub.1 to C.sub.4 alkoxy. The epimers with the S absolute configuration at the chiral carbon site designated by # in formula II are preferred. When R.sub.11 is hydrogen, the epimers with theR absolute configuration at the chiral carbon site designated by an asterisk in formula II are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is O or 1, the epimers with the S absolute configuration at the chiral carbon site designatedby an asterisk in formula II are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is 2, the epimers with the R absolute configuration at the chiral carbon site designated by an asterisk in formula II are preferred. When R.sub.11 is--OR.sub.12 or --NHCOR.sub.12 and n is O, the cis epimers [(2S, 3S) absolute configuration in the azetidine ring] are particularly preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is 1, the cis epimers [(2S, 4R) absolute configuration inthe pyrrolidine ring] are particularly preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is 2, the cis epimers [(2R, 5R) absolute configuration in the piperidine ring] are particularly preferred. The compounds of formula II are useful asintermediate in preparing compounds of formula I.

The present invention also relates to a compound of the formula ##STR7## where W is ##STR8## n is 0, 1, or 2; m is 0, 1, 2, or 3; Y and G are each independently oxygen or sulfur; Z is --O--, --S--, --NH, or --CH.sub.2 ; R.sub.2 and R.sub.3 areeach independently hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, C.sub.1 to C.sub.3 alkylaryl, or C.sub.1 to C.sub.3 alkylheteroaryl; R.sub.5 is C.sub.1 to C.sub.5 alkyl, aryl, or C.sub.1 to C.sub.3 alkylaryl (preferably benzyl); R.sub.6 is halogen[preferably bromide]; R.sub.7 is --COCF.sub.3, --SO.sub.2 CH.sub.3, --SO.sub.2 Ph, or --CO.sub.2 C(CH.sub.3).sub.3 ; R.sub.11 is hydrogen, --OR.sub.12, or --NHCOR.sub.12 ; R.sub.12 is hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3alkyl-aryl; a first chiral carbon is designated by an asterisk; a second chiral carbon is designated by #; and the above aryl groups and the aryl moieties of the above alkyl-aryl groups are independently selected from phenyl and substituted phenyl,wherein said substituted phenyl may be substituted with one to three groups selected from C.sub.1 to C.sub.4 alkyl, halogen (e.g. fluorine, chlorine bromine or iodine), hydroxy, cyano, carboxamido, nitro, and C.sub.1 and C.sub.4 alkoxy. The epimers withthe S absolute configuration at the chiral carbon site designated by # in formula III are preferred. When R.sub.11 is hydrogen, the epimers with the R absolute configuration at the chiral carbon site designated by an asterisk in formula III arepreferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is O or 1, the epimers with the S absolute configuration at the chiral carbon site designated by an asterisk in formula III are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12and n is 2, the epimers with the R absolute configuration at the chiral carbon site designated by an asterisk in formula III are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is O, the cis epimers [(2S, 3S) absolute configuration inthe azetidine ring] are particularly preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is 1, the cis epimers [(2S, 4R) absolute configuration in the pyrrolidine ring] are particularly preferred. When R.sub.11 is --OR.sub.12 or--NHCOR.sub.12 and n is 2, the cis epimers [(2R, 5R) absolute configuration in the piperidine ring] are particularly preferred. The compounds of formula III are useful as intermediates in preparing compounds of formula II.

The present invention also relates to a compound of the formula ##STR9## n is 0, 1 or 2; J is --OH or --CO.sub.2 R.sub.13 ; R.sub.1 is hydrogen, C.sub.1 to C.sub.8 alkyl, substituted C.sub.1 to C.sub.8 alkyl substituted with one hydroxy, C.sub.3to C.sub.8 alkenyl, C.sub.3 to C.sub.8 alkynyl, aryl, C.sub.1 to C.sub.3 alkylaryl, C.sub.1 to C.sub.3 alkylheteroaryl, or --Q--R.sub.4 ; R.sub.4 is cyano, trifluoromethyl, --COR.sub.9, --CO.sub.2 R.sub.9, --CONR.sub.9 R.sub.10, --OR.sub.9, --SO.sub.2NR.sub.9 R.sub.10, or --S(O).sub.q R.sub.9 ; R.sub.9 and R.sub.10 are each independently hydrogen, C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.3 alkylaryl, aryl, or R.sub.9 and R.sub.10 may together be taken to form a three- to seven-membered alkyl ringor a three- to seven-membered heteroalkyl ring having 1 heteroatom of O; R.sub.11 is hydrogen, --OR.sub.12, or --NHCOR.sub.12 ; R.sub.12 is hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkyl-aryl; R.sub.13 is C.sub.1 to C.sub.6 alkyl,aryl, or C.sub.1 to C.sub.3 alkyl-aryl; q is 0, 1, or 2; Q is C.sub.1 to C.sub.3 alkyl; a first chiral carbon is designated by an asterisk; a second chiral carbon is designated by #; and the above aryl groups and the aryl moieties of the above alkyl-arylgroups are independently selected from phenyl and substituted phenyl, wherein said substituted phenyl may be substituted with one to three groups selected from C.sub.1 to C.sub.4 alkyl, halogen, hydroxy, cyano, carboxamido, nitro, and C.sub.1 to C.sub.4alkoxy. The epimers with the S absolute configuration at the chiral carbon site designated by # in formula XVII are preferred. When R.sub.11 is hydrogen, the epimers with the R absolute configuration at the chiral carbon site designated by an asteriskin formula XVII are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is O or 1, the epimers with the S absolute configuration at the chiral carbon site designated by an asterisk in formula XVII are preferred. When R.sub.11 is --OR.sub.12or --NHCOR.sub.12 and n is 2, the epimers with the R absolute configuration at the chiral carbon site designated by an asterisk in formula XVII are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is O, the cis epimers [(2S, 3S) absoluteconfiguration in the azetidine ring] are particularly preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is 1, the cis epimers [(2S, 4R) absolute configuration in the pyrrolidine ring] are particularly preferred. When R.sub.11 is--OR.sub.12 or --NHCOR.sub.12 and n is 2, the cis epimers [(2R, 5R) absolute configuration in the piperidine ring] are particularly preferred. The compounds of formula XVII are useful as intermediate in preparing compounds of formula I.

The present invention also relates to a compounds of the formula ##STR10## n is 0, 1, or 2; R.sub.1 is hydrogen, C.sub.1 to C.sub.8 alkyl, substituted C.sub.1 to C.sub.8 alkyl substituted with one hydroxy, C.sub.3 to C.sub.8 alkenyl, C.sub.3 toC.sub.8 alkynyl, aryl, C.sub.1 to C.sub.3 alkylaryl, C.sub.1 to C.sub.3 alkylheteroaryl, or --Q--R.sub.4 ; R.sub.5 is C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkylaryl; R.sub.4 is cyano, trifluoromethyl, --COR.sub.9, --CO.sub.2 R.sub.9,--CONR.sub.9 R.sub.10, --OR.sub.9, --SO.sub.2 NR.sub.9 R.sub.10, or --S(O).sub.q R.sub.9 ; R.sub.9 and R.sub.10 are each independently hydrogen, C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.3 alkylaryl, aryl, or R.sub.9 and R.sub.10 may together be takento form a three- to seven-membered alkyl ring or a three- to seven-membered heteroalkyl ring having 1 heteroatom of O; R.sub.11 is hydrogen, --OR.sub.12, or --NHCOR.sub.12 ; R.sub.12 is hydrogen, C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3alkyl-aryl; R.sub.13 is C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkyl-aryl; q is 0, 1, or 2; Q is C.sub.1 to C.sub.3 alkyl; a first chiral carbon is designated by an asterisk; and the above aryl groups and the aryl moieties of the abovealkyl-aryl groups are independently selected from phenyl and substituted phenyl, wherein said substituted phenyl may be substituted with one to three groups selected from C.sub.1 to C.sub.4 alkyl, halogen, hydroxy, cyano, carboxamido, nitro, and C.sub.1to C.sub.4 alkoxy. The epimers with the S absolute configuration at the chiral carbon site designated by # in formula XIV are preferred. When R.sub.11 is hydrogen, the epimers with the R absolute configuration at the chiral carbon site designated by anasterisk in formula XIV are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is O or 1, the epimers with the S absolute configuration at the chiral carbon site designated by an asterisk in formula XIV are preferred. When R.sub.11 is--OR.sub.12 or --NHCOR.sub.12 and n is 2, the epimers with the R absolute configuration at the chiral carbon site designated by an asterisk in formula XIV are preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is O, the cis epimers [(2S,3S) absolute configuration in the azetidine ring] are particularly preferred. When R.sub.11 is --OR.sub.12 or --NHCOR.sub.12 and n is 1, the cis epimers [(2S, 4R) absolute configuration in the pyrrolidine ring] are particularly preferred. When R.sub.11is --OR.sub.12 or --NHCOR.sub.12 and n is 2, the cis epimers [(2R, 5R) absolute configuration in the piperidine ring] are particularly preferred. The compounds of formula XIV are useful as intermediates in preparing compounds of formula XVII.

DETAILED DESCRIPTION OF THE INVENTION

The compounds of the present invention are prepared via the following reaction scheme. ##STR11##

Compounds of formula III can be prepared by the Mitsunobu coupling reaction of compounds of formulas IV and V wherein W, n, m, R.sub.5, R.sub.6 (preferably bromide or iodide), and R.sub.7 (preferably trifluoroacetyl [--COCF.sub.3 ]) and R.sub.11are as defined above using a phosphine and an azodicarboxylate in an inert solvent. Suitable phosphines include trialkyl phosphines and triarylphosphines, preferably triphenylphosphine. Suitable azodicarboxylates include dialkyl azodicarboxylates,preferably diethyl diazodicarboxylate. Suitable solvents include methylene chloride, ethers, (tetrahydrofuran, diethyl ether, and 1,4-dioxane), N,N-dimethylformamide and acetonitrile. The preferred solvent is tetrahydrofuran. The reaction is conductedat a temperature of from about 0.degree. C. to about 65.degree. C., most preferably at about 25.degree. C.

Compounds of formula II can be prepared by the transition metal catalyzed cyclization of compounds of the formula III, wherein W, n, m, R.sub.5, R.sub.6 (preferably bromine or iodine), and R.sub.7 (preferably trifluoroacetyl [--COCF.sub.3 ]) andR.sub.11 are as defined above, in a suitable inert solvent with a phase transfer catalyst and a base. Suitable transition metal catalysts include palladium salts such as palladium (II) acetate or palladium (II) chloride and rhodium salts, such astris(triphenyl)rhodium (I) chloride. The preferred catalyst is palladium (II) acetate. Suitable solvents include N,N-dimethylformamide, acetonitrile, and N-methylpyrrolidinone. The preferred solvent is N,N-dimethylformamide. Suitable phase transfercatalysts include tetraalkylammonium halides, preferably tetra-n-butylammonium chloride. Suitable bases include tertiary amines, sodium hydrogen carbonate, and sodium carbonate. The preferred base is triethylamine. The reaction is conducted at atemperature of from about 60.degree. C. to about 180.degree. C., preferably from about 80.degree. C. to about 100.degree. C.

Compounds of formula IA wherein R.sub.1 is hydrogen are prepared by catalytic reduction of a compound of the formula II, wherein W, n, m, and R.sub.5 are as defined above, R.sub.5 is preferably benzyl, under an atmosphere of hydrogen, preferablyat a pressure of from about 1 to about 3 atmospheres, or using a hydrogen source such as ammonium formate or formic acid in an inert solvent. Suitable catalysts include palladium on carbon, Raney nickel, and platinum oxide. The preferred catalyst ispalladium on carbon. Suitable solvents include C.sub.1 to C.sub.6 alcohols, N,N-dimethylformamide, ethyl acetate, and acetonitrile. The preferred solvent is ethanol. The reaction is conducted at a temperature of from about 0.degree. C. to about60.degree. C., preferably about 25.degree. C.

Compounds of formula IB wherein R.sub.1 is not hydrogen can be prepared by the alkylation of a compound of formula IA wherein R.sub.1 is hydrogen, and W, n, and m are as defined above with an alkylating agent of the formula R.sub.1 -LG and a basein an inert solvent, where LG is a suitable leaving group and R.sub.1 is as defined above except for hydrogen. Examples of suitable leaving groups include --I, --Br, --Cl, --OSO.sub.2 Ph, --OSO.sub.2 CH.sub.3, and --OSO.sub.2 CF.sub.3. Suitablealkylating agents include alkyl halides (chlorides, bromides, or iodides), alkyl tosylates, alkyl mesylates, alkyl triflates, .alpha.,.beta.-unsaturated ketones, .alpha.,.beta.-unsaturated esters, .alpha.,.beta.-unsaturated aldehydes,.alpha.,.beta.-unsaturated amides, .alpha.,.beta.-unsaturated nitriles .alpha.,.beta.-unsaturated sulfones, and .alpha.,.beta.-unsaturated sulfonamides. Alkyl halides (e.g. iodides) are preferred. Suitable bases include triethylamine, sodium carbonate,sodium hydrogen carbonate, and sodium hydroxide. The preferred base is triethylamine. Suitable solvents include methylene chloride, chloroform, carbon tetrachloride, acetontrile, tetrahydrofuran, diethyl ether, dioxane, N,N-dimethylformamide,N,N-dimethylacetamide, ethanol, propanol, methanol. The preferred solvent is acetonitrile. The reaction is conducted between a temperature of from about 0.degree. C. to about 150.degree. C. preferably from about 25.degree. C. to about 65.degree. C.

Compounds of formula IV can be prepared via the following reaction scheme: ##STR12## Compounds of formula IX can be prepared by reacting a compound of formula XI wherein W and m are as defined above with either chlorine, bromine, or iodine in aninert solvent with a base. Reaction with bromine is preferred. Suitable solvents include C.sub.1 to C.sub.6 alcohols, methylene chloride, chloroform, or carbon tetrachloride. The preferred solvent is methanol. Suitable bases include triethylamine,pyridine, sodium carbonate, and sodium hydrogen carbonate. The preferred base is sodium hydrogen carbonate. The reaction is conducted at a temperature of from about 0.degree. C. to about 65.degree. C., preferably at about 25.degree. C.

Compounds of formula IV can be prepared by reacting a compound of formula IX wherein W, m, and R.sub.6 are as defined above with the acid chloride or symmetrical anhydride of the formula R.sub.7 OH in an inert solvent with a base. The preferredacid chloride or anhydride is trifluoroacetic anhydride. Suitable solvents include methylene chloride, chloroform as well as ethers, including tetrahydrofuran, diethyl ether and 1,4-dioxane. The preferred solvent is methylene chloride. Suitable basesinclude triethylamine, pyridine, and sodium hydrogen carbonate. The preferred base is pyridine. The reaction is conducted at a temperature of from about 0.degree. C. to about 65.degree. C., preferably at about 25.degree. C.

Compounds of the formula XI can be prepared using methods known to one skilled in the art, such as, for example, as outlined in International Patent Application No. PCT/GB91/00908 and European Patent Application No. 313397A, both of whichcorrespond to U.S. Pat. No. 5,225,431.

Compounds of the formula V can be prepared using the following reaction scheme: ##STR13##

Compounds of the formula VI can be prepared using the Wittig reaction in an inert solvent involving compounds of the formulas VII and VIII wherein n, R.sub.5, and R.sub.11 are defined as above and R.sub.6 is C.sub.1 to C.sub.6 alkyl, aryl, orC.sub.1 to C.sub.3 alkylaryl. Suitable solvents include ethers such a diethyl ether, tetrahydrofuran, and 1,4-dioxane. Tetrahydrofuran is the preferred solvent. The reaction is conducted at a temperature of from about -78.degree. C. to about80.degree. C., preferably at about 25.degree. C.

Compounds of the formula V can be prepared from a hydride reduction of a compound of formula VI wherein n, R.sub.5, R.sub.6, and R.sub.11 are as defined above with a hydride reducing agent in an inert solvent. Suitable hydride reducing agentsinclude lithium aluminum hydride, lithium borohydride, sodium borohydride, and diisobutylaluminum hydride. The preferred reagent is diisobutylaluminum hydride. Suitable solvents include ethers, such as diethyl ether, tetrahydrofuran, 1,4-dioxane and1,2-dimethyoxyethane. The preferred solvent is tetrahydrofuran. The reduction is conducted at a temperature of from about -100.degree. C. to about 0.degree. C., preferably from about -80.degree. C. to about -70.degree. C.

Compounds of the formula VII can be prepared using methods known in the art, such as, for example, as outlined in S. Kiyooka, et al., J. Org. Chem., 5409 (1989) and Y. Hamada, et al., Chem. Pharm. Bull., 1921 (1982).

Compounds of the formula VIII are either commercially available or can be prepared using methods known in the art, such as, for example, as outlined in L. Fieser and M. Fieser, Reagents for Organic Synthesis, John Wiley and Sons, New York, Vol.1, p. 112 (1967).

Compounds of formula I wherein W is (i), Z is 0, m=1, R.sub.3 and R.sub.2 are each hydrogen may also be prepared via the following scheme: ##STR14## where W is (i), Z=0, m=1, R.sub.3 =H, R.sub.2 =H.

Compounds of formula XII, wherein n, R.sub.1 and R.sub.11 are as defined above and K is chloro, bromo or iodo (preferably bromo) can be prepared using methods known in the art, such as, for example, as described in WO 9206973.

Compounds of formula XIV, wherein n, R.sub.1, R.sub.11, and R.sub.5 are as defined above and R.sub.13 is C.sub.1 to C.sub.6 alkyl, aryl, or C.sub.1 to C.sub.3 alkylaryl, can be prepared by coupling a compound of formula XII with a dehydroalaninederivative of formula XIII wherein R.sub.5 is as defined above (preferably benzyl) and R.sub.13 is as defined above (preferably methyl), using the Heck reaction known in the art. Suitable palladium catalysts for the Heck reaction include palladium saltssuch as palladium (II) acetate, in the presence of a phosphine such as triphenylphosphine or tri-o-tolylphosphine, preferably tri-o-tolylphosphine. Suitable bases for the Heck reaction include trialkylamines, preferably triethylamine, and suitable inertsolvents include acetonitrile and N,N-dimethylformamide, preferably acetonitrile. The reaction is conducted at a temperature of from about 60.degree. C. to about 150.degree. C., preferably at the reflux temperature of the solvent.

Compounds of formula XV, wherein R.sub.13, R.sub.1, R.sub.11 and n are as defined above, can be prepared from compounds of formula XIV wherein R.sub.5 is preferably benzyl, by catalytic reduction under an atmosphere of hydrogen, preferably at apressure of from about 1 to about 3 atmospheres, or by using a hydrogen source such as ammonium formate or formic acid an in inert solvent. Suitable catalysts for either of the above reactions include palladium on carbon, Raney nickel and platinumoxide, preferably palladium on carbon. Suitable solvents for either of the above reactions include C.sub.1 to C.sub.6 alcohols, N,N-dimethylformamide, ethyl acetate and acetonitrile. The preferred solvent is ethanol. Optionally the reaction may beconducted in the presence of an acid. Suitable acids include hydrochloric acid. Suitable solvents for use with the acid include all those mentioned previously in this paragraph, preferably ethanol. All of these reactions are conducted at a temperatureof from about 0.degree. C. to about 60.degree. C., preferably at about 25.degree. C.

Compounds of formula XVI, wherein n, R.sub.1, R.sub.11 are as defined above, can be prepared from a compound of formula XV by reduction in an inert solvent. Suitable reducing agents include alkali metal borohydrides, such as sodium borohydrideor lithium borohydride, or lithium aluminum hydrides such as lithium aluminum hydride. The preferred reducing agent is sodium borohydrides. Suitable solvents for borohydride reducing agents include C.sub.1 to C.sub.6 alcohols, preferably ethanol. Suitable solvents for aluminum hydride reductions include ethers, such as tetrahydrofuran and diethyl ether, preferably tetrahydrofuran. The reaction is conducted at a temperature of from about 25.degree. C. to about 80.degree. C., preferably at thereflux temperature of the solvent.

Compounds of formula I, wherein W is (i), Z is 0, m=1, R.sup.3 and R.sup.2 are each H and Y is as defined above, may be prepared by condensation of compounds of formula XVI with phosgene or a phosgene-equivalent in an inert solvent in thepresence of a base. Suitable phosgene-equivalents where Y is O include N,N-carbonyldimidazole, diethyl carbonate and trichloromethyl chloroformate. The preferred reagent is phosgene itself. Suitable solvents include hydrocarbons or ethers, preferablytoluene. Suitable bases include inorganic bases such as sodium hydroxide, potassium hydroxide and sodium carbonate. The reaction may also be carried out with suitable thio-phosgene equivalents where Y is S, such as N,N-thiocarbonyldimidazole. The samereaction conditions used with phosgene are used with thio-phosgene, as well.

The compounds of the formula I which are basic in nature are capable of forming a wide variety of different salts with various inorganic and organic acids. Although such salts must be pharmaceutically acceptable for administration to animals, itis often desirable in practice to initially isolate a compound of formula I from the reaction mixture as a pharmaceutically unacceptable salt and then simply convert the latter back to the free base compound by treatment with an alkaline reagent, andsubsequently convert the free base to a pharmaceutically acceptable acid addition salt. The acid addition salts of the base compounds of this invention are readily prepared by treating the base compound with a substantially equivalent amount of thechosen mineral or organic acid in an aqueous solvent medium or in a suitable organic solvent such as methanol or ethanol. Upon careful evaporation of the solvent, the desired solid salt is obtained.

Those compounds of the formula I which are also acidic in nature, i.e., where R.sub.1 contains a carboxylate, are capable of forming base salts with various pharmacologically acceptable cations. Examples of such salts include the alkali metal oralkaline-earth metal salts and particular, the sodium and potassium salts. These salts are all prepared by conventional techniques. The chemical bases which are used as reagents to prepare the pharmaceutically acceptable base salts of this inventionare those which form non-toxic base salts with the herein described acidic compounds of formula I. These non-toxic base salts includes those derived from such pharmaclogically acceptable cations as sodium, potassium, calcium, magnesium, etc. These saltscan easily be prepared by treating the corresponding acidic compounds with an aqueous solution containing the desired pharmacologically acceptable cations, and then evaporating the resulting solution to dryness, preferably under reduced pressure. Alternatively, they may also be prepared by mixing lower alkanolic solutions of the acidic compounds and the desired alkali metal alkoxide together, and then evaporating the resulting solution to dryness in the same manner as before. In either case,stoichiometric quantities of reagents are preferably employed in order to ensure completeness of reaction of maximum product of yields of the desired final product.

The compounds of the formula I and the pharmaceutically acceptable salts thereof (hereinafter, also referred to as the active compounds of the invention) are useful psychotherapeutics and are potent serotonin (5-HT.sub.1) agonists and may be usedin the treatment of depression, anxiety, eating disorders, obesity, drug abuse, cluster headache, migraine, chronic paroxysmal hemicrania and headache associated with vascular disorders, pain, and other disorders arising from deficient serotonergicneurotransmission. The compounds can also be used as centrally acting antihypertensive and vasodilators.

The active compounds of the invention can be evaluated as anti-migraine agents by testing the extent of to which they mimic sumatriptan in contracting the dog isolated saphenous vein strip [P. P. A. Humphrey et al., Br. J. Pharmacol. 94, 1128(1988)]. This effect can be blocked by methiothepin, a known serotinin antagonist. Sumatriptan is known to be useful in the treatment of migraine and produces a selective increase in carotid vascular resistance in the anesthesized dog. It has beensuggested [W. Fenwick et al., Br. J. Pharmacol., 96, 83 (1989)] that this is the basis of its efficacy.

The serotonin 5-HT.sub.1 agonist activity of the compounds of the present invention can be measured in vitro receptor binding assays as described for the 5-HT.sub.1A receptor using rat cortex as the receptor source and [.sup.3 H]-8-OH-DPAT as theradioligand [D. Hoyer et al. Eur. J. Pharm., Vol. 118, 13 (1985)] and as described for the 5-HT.sub.1D receptor using bovine caudate as the receptor source and [.sup.3 H]serotonin as the radioligand [R. E. Heuring and S. J. Peroutka, J. Neuroscience,Vol. 7, 894 (1987)] 5-HT.sub.1 agonist activity is defined by agents with affinities (IC.sub.50 's) of 250 nM or less at either binding assay.

The compositions of the present invention may be formulated in a conventional manner using one or more pharmaceutically acceptable carriers. Thus, the active compounds of the invention may be formulated for oral, buccal, sublingual, intranasal,parenteral (e.g., intravenous, intramuscular or subcutaneous) or rectal administration or in a form suitable for administration by inhalation or insufflation.

For oral administration, the pharmaceutical compositions may take the form of, for example, tablets or capsules prepared by conventional means with pharmaceutically acceptable excipients such as binding agents (e.g. pregelatinized maize starch,polyvinylpyrrolidone or hydroxypropyl methylcellulose); fillers (e.g. lactose, microcrystalline cellulose or calcium phosphate); lubricants (e.g. magnesium stearate, talc or silica); disintegrants (e.g. potato starch or sodium starch glycolate); orwetting agents (e.g. sodium lauryl sulphate). The tablets may be coated by methods well known in the art. Liquid preparations for oral administration may take the form of, for example, solutions, syrups or suspensions, or they may be presented as a dryproduct for constitution with water or other suitable vehicle before use. Such liquid preparations may be prepared by conventional means with pharmaceutically acceptable additives such as suspending agents (e.g. sorbitol syrup, methyl cellulose orhydrogenated edible fats); emulsifying agents (e.g. lecithin or acacia); non-aqueous vehicles (e.g. almond oil, oily esters or ethyl alcohol); and preservatives (e.g. methyl or propyl p-hydroxybenzoates or sorbic acid).

For buccal and sublingual administration the composition may take the form of tablets or lozenges formulated in conventional manner.

The active compounds of the invention may be formulated for parenteral administration by injection, including using conventional catheterization techniques or infusion. Formulations for injection may be presented in unit dosage form e.g. inampules or in multi-dose containers, with an added preservative. The compositions may take such forms as suspensions, solutions or emulsions in oily or aqueous vehicles, and may contain formulating agents such as suspending, stabilizing and/ordispersing agents. Alternatively, the active ingredient may be in powder form for reconstitution with a suitable vehicle, e.g. sterile pyrogen-free water, before use.

The active compounds of the invention may also be formulated in rectal compositions such as suppositories or retention enemas, e.g., containing conventional suppository bases such as cocoa butter or other glycerides.

For intranasal administration or administration by inhalation, the active compounds of the invention are conveniently delivered in the form of a solution or suspension from a pump spray container that is squeezed or pumped by the patient or as anaerosol spray presentation from a pressurized container or a nebulizer, with the use of a suitable propellant, e.g. dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas. In the case of apressurized aerosol, the dosage unit may be determined by providing a valve to deliver a metered amount. The pressurized container or nebulizer may contain a solution or suspension of the active compound. Capsules and cartridges (made, for example,from gelatin) for use in an inhaler or insufflator may be formulated containing a powder mix of a compound of the invention and a suitable powder base such as lactose or starch.

A proposed dose of the active compounds of the invention for oral, parenteral or buccal administration to the average adult human for the treatment of the conditions referred to above (e.g., migraine) is 0.1 to 200 mg of the active ingredient perunit dose which could be administered, for example, 1 to 4 times per day.

Aerosol formulations for treatment of the conditions referred to above (e.g., migraine) in the average adult are preferably arranged so that each metered dose or "puff" of aerosol contains 20 .mu.g to 1000 .mu.g of the compound of the invention. The overall daily dose with an aerosol will be within the range 100 .mu.g to 10 mg. Administration may be several times daily, for example 2, 3, 4 or 8 times, giving for example, 1, 2 or 3 doses each time.

The following Examples illustrate how the compounds of the present invention can be prepared. Commercial reagents can be utilized without further purification. Room temperature refers to 20-25.degree. C.

EXAMPLE 1

General Procedure for the Alkylation of (R)-3-pyrrolidin-2-ylmethyl-1H-indoles

To a stirred solution of the (R)-3-(pyrrolidin-2-ylmethyl)-1H-indole (1.00 mmol) and triethylamine (0.126 g, 1.25 mmol, 1.25 eq) in either anhydrous methylene chloride, anhydrous acetonitrile, absolute ethanol, or i-propanol (10 mL) at roomtemperature under nitrogen is added dropwise the alkylating agent (1.25 mmol). The resulting reaction solution is then stirred under nitrogen at room temperature or heated at reflux for 1 to 20 hours, depending on substrate. The resulting reactionmixture is directly column chromatographed using silica gel (approximately 25 g) and elution with methylene chloride:methanol:ammonium hydroxide [9:1:0.1] to afford the title compound.

General Procedure for the Catalytic Reduction of 3-(N-Benzyloxycarbonylpyrrolidin-2-ylmethyl)-1H-indoles Forming 3-(Pyrrolidin-2-ylmethyl)-1H-indoles

A mixture of the 3-(N-Benzyloxycarbonylpyrrolidin-2-ylmethyl)-1H-indole (2.00 mmol) and 10% palladium on carbon (0.20 g) in absolute ethanol (15 mL) is shaken under a hydrogen atmosphere (3 atm) for 4 to 24 hours, depending on substrate. Theresulting reaction mixture is filtered through diatomaceous earth, and the filtrate is evaporated under reduced pressure. The residue is column chromatographed using silica gel (approximately 50 g) and elution with a solution of methylene chloride:methanol:ammonium hydroxide [8:2:0.2] or other appropriate solvent system to afford the corresponding 3-(pyrrolidin-2-ylmethyl)-1H-indole.

General Procedure for the Formation of 3-(Pyrrolidin-2-ylmethyl)-1H-indoles Via the Palladium Catalyzed Cyclization of 1-(N-Pyrrolidin-2-yl)-3-(N-(2-halophenyl)-N-trifluoroacetylamino)propenes

A mixture of the 1-(pyrrolidin-2-yl)-3-(N-(2-halophenyl)-N-trifluoroacetylamino)propene (2.00 mmol), tetrabutylammonium chloride (2.00 mmol), and palladium(II) acetate (0.089 g, 0.40 mmol, 0.2 eq) in a solution of triethylamine (8 mL) andanhydrous N,N-dimethylformamide (4 mL) is heated at reflux under nitrogen for 2 hours. The resulting reaction mixture is evaporated under reduced pressure, and the residue is partitioned between ethyl acetate (25 mL) and water (25 mL). The ethylacetate layer is removed, and the aqueous layer is extracted with ethyl acetate (25 mL). The organic extracts are combined, dried (MgSO.sub.4), and evaporated under reduced pressure. The residue is column chromatographed using silica gel (approximately50 g) and elution with an appropriate solvent system to afford the corresponding 3-(pyrrolidin-2-ylmethyl)-1H-indole.

General Procedure for the Formation 1-(Pyrrolidin-2-yl)-3-(N-(2-halophenyl)-N-trifluoroacetylamino)propenes from the Mitsunobu Coupling of 2-Halo-N-trifluoroacetylanilines with 1-(pyrrolidin-2yl)-3-hydroxypropenes

To a stirred solution of triphenylphosphine (0.655 g, 2.50 mmol, 1.25 eq) and diethyl azodicarboxylate (0.39 mL, 2.48 mmol, 1.25 eq) in anhydrous tetrahydrofuran (15 mL) at 0.degree. C. under a nitrogen atmosphere is added dropwise a solution ofthe 2-halo-N-trifluoroacetylaniline (2.5 mmol, 1.25 eq) in anhydrous tetrahydrofuran (5 mL). This is then followed by the dropwise addition of a solution of 1-(pyrrolidin-2-yl)-3-hydroxypropene (R, or S, or racemate, 2.00 mmol) in anhydroustetrahydrofuran (5 mL). The reaction solution is slowly warmed to 25.degree. C. over the course of 2 hours, and then stirred at 25.degree. C. under a nitrogen atmosphere for an additional 12 hours. The resulting reaction solution is evaporated underreduced pressure, and the residue is column chromatographed using silica gel (approximately 150 g) and elution with an appropriate solvent system to afford the corresponding 1-(pyrrolidin-2-yl)-3-(N-(2-halophenyl)-N-trifluoroacetyl-amino)propene.

To a stirred mixture of the N-trifluoroacetylaniline (2.00 mmol) and sodium hydrogen carbonate (0.21 g, 2.50 mmol, 1.25 eq) in methanol (10 mL) at 0.degree. C. is added dropwise bromine (0.113 mL, 2.19 mmol, 1.1 eq). The resulting reactionmixture is then stirred at 25.degree. C. for 30 minutes. The reaction mixture is then evaporated under reduced pressure, and the residue is placed in water made acidic to pH 3 with HCl (10 mL). This aqueous mixture is extracted with ethyl acetate(3.times.15 mL). The extracts is combined, dried (MgSO.sub.4), and evaporated under reduced pressure. The residue is column chromatographed using silica gel (approximately 50 g) and elution with an appropriate solvent system to afford the corresponding2-bromo-N-trifluoroacetylaniline.

To a stirred solution of the aniline (2.00 mmol) and pyridine (0.18 mL, 2.22 mmol, 1.1 eq) in anhydrous methylene chloride (10 mL) at 0.degree. C. under a nitrogen atmosphere is added dropwise trifluoroacetic anhydride (0.31 mL, 2.19 mmol, 1.1eq). The resultant reaction mixture is stirred at 0.degree. C. under a nitrogen atmosphere for 3 hours. Water is added (15 mL), and this aqueous mixture is extracted with ethyl acetate (3.times.15 mL). The extracts are combined, dried (mgSO.sub.4),and evaporated under reduced pressure. If necessary, the residue is column chromatographed using silica gel (approximately 50 g) and elution with an ethyl acetate gradient in hexanes to afford the corresponding N-trifluoroacetylaminobenzene.